/******************************************************************************
* Copyright (C) 2012-2013  Fabio Zadrozny
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
*     Fabio Zadrozny <fabiofz@gmail.com> - initial API and implementation
******************************************************************************/
package org.python.pydev.shared_core.utils;

import org.eclipse.core.runtime.Platform;
import org.eclipse.osgi.service.environment.Constants;
import org.python.pydev.shared_core.log.Log;
import org.python.pydev.shared_core.utils.internal.linux.ProcessListLinux;
import org.python.pydev.shared_core.utils.internal.macos.ProcessListMac;
import org.python.pydev.shared_core.utils.internal.win32.ProcessListWin32;

public class PlatformUtils {

    /**
     * Currently we only care for: windows, mac os or linux (if we need some other special support,
     * this could be improved).
     */
    public static Integer platform;

    public static int WINDOWS = 1;

    public static int MACOS = 2;

    public static int LINUX = 3;

    static {
        try {
            String os = Platform.getOS();
            if (os.equals(Constants.OS_WIN32)) {
                platform = WINDOWS;
            } else if (os.equals(Constants.OS_MACOSX)) {
                platform = MACOS;
            } else {
                platform = LINUX;
            }

        } catch (NullPointerException e) {
            String env = System.getProperty("os.name").toLowerCase();
            if (env.indexOf("win") != -1) {
                platform = WINDOWS;
            } else if (env.startsWith("mac os")) {
                platform = MACOS;
            } else {
                platform = LINUX;
            }
        }
    }

    /**
     * @return whether we are in windows or not
     */
    public static boolean isWindowsPlatform() {
        return platform == WINDOWS;
    }

    /**
     * @return whether we are in MacOs or not
     */
    public static boolean isMacOsPlatform() {
        return platform == MACOS;
    }

    /**
     * @return whether we are in Linux or not
     */
    public static boolean isLinuxPlatform() {
        return platform == LINUX;
    }

    public static IProcessList getProcessList() {
        if (isWindowsPlatform()) {
            return new ProcessListWin32();
        }
        if (isLinuxPlatform()) {
            return new ProcessListLinux();
        }
        if (isMacOsPlatform()) {
            return new ProcessListMac();
        }

        Log.log("Unexpected platform. Unable to list processes.");
        return new IProcessList() {

            @Override
            public IProcessInfo[] getProcessList() {
                return new IProcessInfo[0];
            }
        };
    }
}